Join Date: Mar 2010
Location: Pittsburgh, Pistolvania
So much misinformation in this thread. It IS very possible... I did it in my 07 G5 base when I still had it.
Ok. You do NOT need to change the BCM. Not at all. If you tried the reflash, but the dealer told you it was "incompatable", your car simply didn't have the wiring already done for you, and you just needed to do it yourself (see below)
There are two ways that this can go... the easy way or the hard way... depending on how GM wired your car.
The easy way: GM prewired the radio and cruise wires that go from the clock spring to their respective pinouts on the Radio harness and BCM connectors. If you have a wire populated in Pin 61 of the BCM connector (found in the passenger side fuse panel), then your car is already prewired and all you need to do is buy a Cobalt SS steering wheel matching your model year (2010 would be SS/TC). Simply do the steering wheel swap, plugging the new harness into the clock spring, and then take it to the dealership and play dumb and act like your cruise just suddenly stopped working (Since I believe GM is cracking down on the retrofit jobs). They'll charge you an hour of labor at most to reflash the BCM with the Tech II to turn the cruise feature on. Radio controls should work right off the bat.
The hard way: If you don't have a populated Pin61 in your BCM connector, you will need to obtain the pins in order to add the wire that goes from your clock spring to Pin61 of the BCM. You will need the pin that goes into the clock spring and the pin that goes to the BCM (Get these from a junker). You will need to connect these pins to a wire and make the connection from the clock spring (in the proper location matching the cruise pins on the steering wheel harness) to Pin61 of the BCM connector. Then proceed to do the dealership flash with the Tech II to enable.
Generally, I believe the cars that tend to be prewired are the cars that were on the LT line at Lordstown. The ones that seem to need wiring added usually are the LS/Base cars that have pretty much power nothing.
GM Stage II | 2nd Gen Projectors | 5000K Low Beams | 3000K HID Fogs | LED Tails| SS/TC Seats
▲RIP 2007 G5: Totalled 1/26/10▲
Last edited by Nighthawk243; 05-21-2011 at 01:02 AM.